base_audits_controller.rb

class BaseAuditsController < ApplicationController
  def self.inherited(other)
    other.class_eval do
      resource_name = controller_path.split('/').first.singularize

      define_method("set_#{resource_name}") do
        resource = organization.public_send(resource_name.pluralize).find(params["#{resource_name}_id"])
        instance_variable_set("@#{resource_name}", resource)
      end

      before_action :"set_#{resource_name}"
    end
  end
end